Concrete cancer often becomes visible gradually. The earlier warning signs are not always dramatic, but they are worth investigating before a larger section of concrete breaks away.
Rust staining
Brown or orange staining can indicate corrosion products moving through cracks or porous concrete.
Cracking and spalling
Cracks that run along slab edges or reinforcement lines, flaking surfaces and missing pieces of concrete are common signs.
Drummy concrete
Areas that sound hollow when professionally checked can indicate delamination beneath the surface.
Exposed reinforcement
Visible rusty steel means the protective concrete cover has already been lost in that area and warrants assessment.
What to do next
Take clear photos of the wider area and close up damage, note the property location and where the concrete is situated, then arrange an on site assessment so the repair scope can be priced accurately.